#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int bin_search(int arr[], int left, int right, int key)
{
	int mid = 0;
	while (left <= right)
	{
		mid = left + ((right - left) >> 1);
		if (arr[mid] < key)
		{
			left = mid + 1;
		}
		else if (arr[mid] == key)
		{
			return mid;
		}
		else
		{
			right = mid - 1;
		}
	}
	return -1;
}
int main()
{
	int arr[10] = { 1,2,3,4,5,6 };
	int len = sizeof(arr) / sizeof(arr[0]);
	int ret = bin_search(arr, 0, len - 1, 14);
	printf("%d\n", ret);
}
